Answer:
Let, Triangle =x
Quadrilateral =y
And, Hexagon =z
Equations which are represented in terms of numbers and Polgons can be written as
1. x+y+y=z
x+2y=z
2. x+1+x=y
2x+1=y
3. x+y+z=11
4. z-y=4x
x+2y-y=4x-----[using 1]
y=4x-x
y=3x
Equation 2 is
2x+1=y
2x+1=3x
1=3x-2x
x=1
y=3
z=x+2y
=1 +2×3
=1+6
=7
So, Triangle =1
Quadrilateral =3
And, Hexagon=7